Midea MCCDH30A-TA3SL, Техническое и сервисное руководство

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Air-cooled modular chiller unit
Under heating mode, when the main unit board detects total water outlet temperature to be lower than 45
℃
, the switch will be
closed, and the auxiliary electric heater will begin to work; when the total water outlet temperature is higher than 50
℃
, the
switch will be opened, and the auxiliary electric heater will stop working.
20
PUMP:
Attention: the control port value of the pump actually detected is ON/OFF but not 220-230V control power supply, so special
attention should be paid when installing the pump.
1) After receiving start-up instruction, the pump will be started up instantly, and will maintain start-up state always in the
process of operation.
2) In case of refrigerating or heating shutdown, the pump will be shut down 2 minutes after all modules stop operating.
3) In case of shutdown under the pump mode, the pump can be directly shut down.
21
One compressor of the system B(B1).
Neutral wire.
Four-way valve of the system B.
Neutral wire.
22
Numerical code tube.
1) In case of stand-by, the address of the module is displayed.
2) In case of normal operation, 10. is displayed (10 is followed by dot).
3) In case of fault or protection, fault code or protection code is displayed.
23
One compressor of the system A(A1).
Neutral wire.
Four-way valve of the system A.
Neutral wire.
24
Outdoor fan A, controlled by T4.
25
Outdoor fan B, controlled by T4.
26
PWM pressure relieve valve control(For digital compressor).
27
Input of transformer, 220-230V AC current. (Only valid for the main unit).
28
Input of three-phase four-wire power supply (Fault code E1).
Three phases A, B and C of power supply should exist simultaneously, and the difference of phase angle should be 120º
among them. If the conditions are not met, fault of phase sequence or phase lack may occur, and fault code will be displayed.
When the power supply returns to normal condition, fault is removed. Attention: phase lace and phase dislocation of power
supply are detected only in the early period after the power supply is connected, and they are not detected while the unit is in
operation.
29
Output of transformer.
30
Power port for the current board.
31
One compressor of the system B(B2).
Neutral wire.
One compressor of the system A(A2).
Neutral wire.
32
The alarm signal output of the unit(ON/OFF signal).
33
Anti-freezing pressure protection of the system A(Protection code Pc).
Anti-freezing pressure protection of the system B(Protection code Pd).
34
Remote control port(ON/OFF signal, effect on NO.0 unit).
1. Dial the code S7 in the main control board to the “ON” position and enter to the remote control mode (The wired controller is
invalid).
2. If the port is closed, the unit is turned on, else, the unit is turned off.
35
Remote mode control port(ON/OFF signal, effect on NO.0 unit)
1. Dial the code S7 in the main control board to the “ON” position and enter to the remote control mode (The wired controller is
invalid).
2. First, the ON/OFF port is closed, the second, if this port is closed, the unit enters the heating mode, else, the unit enters
cooling mode.
1. Faults
When the main unit suffers faults, the main unit stops operating, and all other units also stop running;
When the subordinate unit suffers faults, only the unit stops operating, and other units are not affected.
2. Protection
When the main unit is under protection, only the unit stops operating, and other units keep running;
When the subordinate unit is under protection, only the unit stops operating, and other units are not affected.